Пакет kernel-modules-v4l2loopback-un-def: Информация

v4l2loopback kernel module.

This module allows you to create "virtual video devices". Normal (v4l2)
applications will read these devices as if they were ordinary video devices,
but the video will not be read from e.g. a capture card but instead it is
generated by another application. This allows you for instance to apply some
nifty video effects on your Skype video... It also allows some more serious
things (e.g. I've been using it to add streaming capabilities to an application
by the means of hooking GStreamer into the loopback devices).